SIVAK, Jacob G; STRONG, Graham. Simple Clinical Photokeratoscopy. Canadian Journal of Optometry, [S. l.], v. 44, n. 1, p. 2, 1982. DOI: 10.15353/cjo.v44i1.4195. Disponível em: https://www.cjo-rco.ca/index.php/cjo/article/view/4195. Acesso em: 31 jan. 2026.